main {
  margin: 5px auto;
  padding: 0 10px;
  color: #222;
}

.centered {
  text-align: center;
}

input,
video {
  width: 270px;
}

li {
  text-align: left;
  max-width: 200px;
  margin: 0 auto;
}

summary {
  font-weight: normal;
  text-align: center;
}